Signaling system



Dec. 19, 1939. H PRUDEN 2,183,941

' SIGNALING SYSTEM Filed Feb. 11. 1937 /N VE N TOR H. MPM/DEN A TTORNEV Patented Dec. 19, 1939 UNITED STATES PATENT .ortica SIGNALING SYSTEM Application February 1 2 Claims.

This invention relates to signaling systems and particularly to improvements in systems for selective signaling of stations.

The objects of the invention are to increase the eiiciency and utility of selective signaling systems by providing means for utilizing standard dialing equipments in connection with signaling in systems of this kind.

Heretofore, systems have been used in which step-by-step selectors, located at different stations and connected by a single wire, were selectively controlled by code impulses to cause a corresponding station to be signaled. A system of this kind is disclosed in the Patent 1,961,385 -to Henry W. ONeill of June 5, 1934. In this system the calling of the various stations was done by code signals produced by a manual key that opened and closed the single wire between the stations to operate the selectors at the various stations.

It is a feature of the present invention to provide means whereby an ordinary telephone dial may be used for the production of the code signals and to translate these dial pulses into equiv- 25 alent series of impulses, produced at a lower speed and transmitted over the single wire to select a station. The arrangement is such that as soon as a digit or code number has begun to be transmitted, a corresponding translated 30 series of impulses will immediately begin to be transmitted and the speed of transmission is adjusted to the electrical requirements of the single wire.

The invention has been disclosed in the accompanying drawing in which:

The drawing shows an order wire with equipment required for translating dial pulses at one station in detail with two other stations in diagrammatic form as well as a portion of the single 40 wire for selecting of stations.

In general the arrangement of this system has been shown with an order wire I and a single wire I for the selection of stations. Equipment C at one station has been shown in detail and `an operators position for dialing series of impulses and translating them into an equivalent series at a speed independent of the speed at which the original impulses are dialed. The translated impulses are transmitted to the equipment indicated by the box D which may be identical to the equipment shown in detail at C in the above-mentioned patent to H. W. ONeill for receiving such translated impulses and selecting a station by interruption of the circuit through the single wire I0 in accordance with a 1, '1937, Serial No. 125,241

corresponding code comprising two series of such translated impulses. The speed of interruption of this circuit over wire I0 is adjusted to the electrical characteristics of this line. The selection of a station may be indicated by the lighting of a lamp at the selected station, as for example, if station I were selected, the lamp 4 would be lighted. In this case the operator at A would insert the plugs |02 of an answering cord into the jacks |00 and thus establish a talking connection over the order wire to the called station. The called station would similarly insert the plugs of an answering cordinto corresponding jacks to converse with the operator at the calling station. v

A detailed description will now be made of a call from one operator to another employing order wire I for the talking connection. If it is assumed that the operator at A inserts the plugs |02 into jacks |00, a circuit will be completed for the operation of relay |05 from battery through the winding of this relay, the sleeves of the jacks |00 and plugs |02 to ground. vThis relay in operating closes a circuit for the operation of relay |01 from battery, contacts of relay |05, winding of relay |01 to ground. The operation of relay |01 opens the bridge circuit through a resistance |08 across the right-hand winding of the induction coil |09, the left-hand winding of which is connected across the two conductors oi the order Wire I. This bridge is provided for normally short-cirouiting the right-hand winding of the repeating coil |09 to maintain the normal transmission loss of the order wire I.

Relay |05 also closes an obvious circuit for relay 3 |I0 to open the circuit for relay III. The circuit for relay III may be closed to operate thisl relay to light lamp I I2 when this station is being called and is in that respect similar to the lamp 53, for example, in the above-mentioned H. W. ONeill patent. The operator at position A may now aetuate dial |03 to transmit the desired code which consists as hereinbefore stated of two digits and which will be assumed to be 5, 2. O-n the insertion of plugs |02 into jacks |00, a circuit is also completed for relay I I5 from battery, lower winding of this relay, lower jack |00 and the lower plug |02, dial contacts of dial |03, the upper plug |02 and upper jack |00, upper winding of relay H2 to ground.` Therefore on each interruption of the dial contacts relay ||5 will be released. On the rst operation of relay I|5 relay H3 is operated over an obvious circuit so that on the release of relay I|5 a circuit is completed for relay H4 and battery through the winding of this relay, contact of relays H3 and ||5 to ground. Relays |I3 and |I4 are slow in releasing so remain operated during the pulsing of the digit. On the operation of relay I I4, relay 5 H6 is operated over an obvious circuit to open at its armatures and back contacts a talking connection from the order wire I through the condensers ||1 and H8 to the calling operator over jacks |00. On each release of relay I I5, a circuit 1() is therefore completed for the rotary magnet I |9 from battery, the winding of this magnet, contacts of relays |20, H3 and H5 to ground. Magnet I I 9 in operating operates the brushes I2| and |22 of the step-by-step switch S, which now is set in accordance with impulses of the first digit to register it. Onthe rst rotary step of the switch S, the rotary off-normal contacts are operated and a circuit is completed from battery through the winding of relay |26, resistances 2() |21, contacts of relays |28 and |29 to ground at rotary off-normal contacts |25. Relay |26 in operating closes an obvious circuit for the operation of relay |28. Relay |281 in operating opens the circuit for relay |26 which is slow in releasing 25 and when it releases relay 28 also releases and this relay in turn is slow in releasing. This cycle of operation of relays |26 and |28 is repeated at a definite speed depending on the slow release characteristics of relays |26 and |28. The operation and release of these relays provides a pulsing circuit for the rotary magnet |3I from battery through the winding of this magnet, contact of relays |28 and |26 to ground. Rotary magnet |3| steps the brushes |32 and |33 of the step-bystep switch S1, and the brushes are stepped as many steps as there are pulses in the rst digit registered on switch S but at a lower speed Another pulsing circuit is also prepared by the operation and release of these: relays |26, |28 from battery through the winding of relay 200, contacts of relays |28 and |26 to ground and relay 200 is therefore stepped at the required speed, one for each impulse transmitted by the dial |03 during the rst digit. Relay 200 will interrupt the single line I0 in accordance with the speed of operation and release of relays |26 and |28 which is the required speed ior transmitting impulses over line I0. This relay 200 corresponds to relay 35 in the above-mentioned patent to H. W. ONeill. At the end oi the first digit when relay H5 is held operated, relay ||4 will release and this relay in turn closes a circuit for the operation of relay |20 from battery, winding of relay |20, rotary off-normal contacts |25 to ground at contacts of relay H4. Relay |20 in operating closes a locking circuit for itself through its lower armature and front contact to ground and the rotary off-normal contacts |25. Now on the reception of the impulses of the second digit, each time relay H5 is released a circuit will be completed for the stepping magnet |35 from battery through the winding of this magnet, contact of relays |20, H3 and H5 causing the brush I 36 of the switch S2 to step the number of steps as controlled by the second digit to record it.

When the rotary magnet I3| has operated, a number of times corresponding to the rst digit, a circuit will be completed by the operation of relays |29 and |40, the circuit for relay |29 extending from battery through the winding of this relay, brush |33, the desired terminals as detere mined by the position of the brushes |32 and |22 to ground. Relay |29 in operating closes a locking circuit for itself through its armature tion of relay I4I.

and front contact to ground at the rotary 01T- normal contacts |25 and opens the circuit for operating and releasing relays |26 and |28 causing these relays to cease producing additional impulses for operating magnet |3I and relay 200. Relay |40 operates from battery, winding of this relay, contacts of relay I 4I, brushes |33 and I 22 to ground. Relay |40 in operating closes an obvious circuit for the winding of relay |42 which in turn closes an obvious circuit for the opera- Relay I4| in operating closes a locking circuit for itself from battery through its lower armature and front contacts of relay |29 to ground at rotary oi-normal contacts |25. Relay I4I is slow in operating. When it does operate it opens the circuit for relay |40 which is slow in releasing and this relay in turn releases relay |42 which is also slow in releasing. This is to provide an interval between the impulses of the rst digit and the second digit. When relay |40 releases and before relay |42 is released, a circuit is completed for release magnet |45 from battery, Winding of this magnet, of`r`normal contacts |46 of the switch S1, contacts of relays I 42 and |46 to ground. This causes the release of switch Si. When relay |42 releases it closes a circuit for the reoperation of relay |26 from battery through the winding of this relay, resistances |21, contact of relays |28 and |39, rotary off-normal contacts I 31 of the rotary switch S2, contacts of relays I4| and |42 to ground. This causes the operation of relay |28 and this relay in turn releases relay |26. These relays are then operated and released to transmit impulses of the second digit for the operation of relay 200 over a circuit as hereinbefore described and also causes the rotary magnet |3| to again step in response to these impulses as hereinbefore described. When the brush |32 of switch S1 arrives to the position occupied by the brush |36 of the rotary switch S2 a circuit will be completed for the operation of relay |39 from battery, winding of this relay, brushes |32 and |36, contact of relays I4I and 42 to ground. Relay |39 in operating opens the circuit for relays |26 and |28 which now cease sending impulses representing the second digit to the relax7 200 and provides a locking circuit for itself from battery through its winding and armature and front Contact, rotary off-normal contact |31, contact of relays |4| and |43 to ground. The relays and switches of the dialing and control circuits C, now remain in the position in which they have been set. That is, relays H5, H3, |20, |29, |39, |4I, remain operated and switches S, S1 and S2 remain in the position in which they were set until the connection at the operators position A is released by the removal of the plugs |02 from the jacks 00 when relay H5 releases, causing the release of relay H3. Relay II 3 in releasing closes circuits for the release magnets of these switches as follows: For the switch S a circuit is completed from battery through the release magnet |41, brush I2I, contacts of relays H3 and H5 to ground; for the switch Si from battery through the release relay |49, rotary off-normal contact |46 to ground through contacts of relays H3 and H5, relay |49 in operating closing a circuit for the release magnet I 45 which causes the release of switch S1. The circuit for release magnet |50 for switch S2 extends from battery, winding of release magnet |50, off-normal contacts |31 to ground through contacts of relays H3 and H5. On the return of these switches to normal, the circuits for the release magnets are opened at the respective rotary off-normal contacts of the switches. Relays MI and |29 are then released due to the opening of the rotary off-normal contacts |25.

It will therefore be seen that relay D of the equipment D at this station will receive impulses representing the two digits dialed and that these impulses are received at a rate suitable for interrupting the line IU and setting the switches of equipments such as are disclosed in the abovementioned patent to H. W. ONeill in accordance with these digits to select a called station. This rate is slower than the rate at which impulses are transmitted by the dial |03. When these equipments have operated to select the called station lamps corresponding to lamps 4 and H2 will be lighted at the called station. The operator at this station will then insert the plugs of an answering cord into the associated jacks corresponding to jacks |00 and conversation may then take place between the calling operator and the called operator over the order wire l through condensers lll and H8 and induction coil H9 and corresponding apparatus at the called station for the transaction of whatever business is required in connection with this kind of service.

What is claimed is:

1. In an impulse translating device, a dial, means responsive to the operation of said dial for transmitting series of impulses at a speed determined by the speed of operation of said dial and of a number depending on the setting of said dial, a step-by-step switch controlled by said first series of impulses from said dial, an impulse operating device for producing two other series of impulses at a speed slower than the speed of a rst series of impulses produced by the dial, means for starting said impulse operating device operative when said switch has taken one step,

a second step-by-step switch controlled by one of said two series of impulses, means for stopping said impulse operating device operative when said second switch has operated the samenumber of times as the rst switch, a delay device then j operative for releasing the second switch a certain interval after it has been stopped, a third step-by-step switch controlled by a second series of impulses ,produced by the dial, a circuit means controlled jointly by said delay device and by said third switch when it has taken one step for again starting the impulse operating device to again operate said second switch, a circuit controlled jointly by said delay device and by said second and third switches when the second switch has operated the same number of times as the third switch for stopping said impulse operating device, and means for thereafter restoring all three'switches to normal.

2. In an impulse translating device, a dial,

means responsive to the operation of said dial for producing two succeeding series of impulses, means for translating said series of impulses into equivalent series of impulses at a slower speed, and means for starting the rst series of translated impulses as soon ras the rst impulse of the first series of original impulses is produced by the dial and for starting the second series of translated impulses a fixed interval after the rst series of translated impulses has been transmitted if the production of the second series of original impulses has started prior to the elapse of said interval, or for starting the second series of translated impulses as soon as the rst impulse of the second series of original impulses has been produced if the production of the second` HAROLD M. PRUDEN. 

